Question

我目前正在使用此示例代码生成一个ImageView，其下方有一个按钮，按下时会生成一个日志。

- (void)loadView {
[super loadView];

imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"SteveJobsMacbookAir.JPG"]];
[imageView setFrame:CGRectMake(80.0, 20.0, 160.0, 230.0)];
[imageView setContentMode:UIViewContentModeScaleAspectFit];

[[self view] addSubview:imageView];

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:@selector(cropImage) forControlEvents:UIControlEventTouchUpInside];
[button setFrame:CGRectMake(124.0, 258.0, 72.0, 37.0)];
[button setTitle:@"Crop!" forState:UIControlStateNormal];

[[self view] addSubview:button];
}

当我按下＆＃34;裁剪！＆＃34;按钮，上面图片的大小改变大小：

- (void)cropImage {
[imageView setFrame:CGRectMake(80.0, 20.0, 160.0, 230.0)];
}

但是，按钮保持在同一位置，而不是在图像下方。如何重新调整图像的框架，同时让按钮再次移动到其下方？

Answer 1

只需将按钮的y位置设置为相对于imageView的y位置的变量。试试这个

[button setFrame:CGRectMake(124.0, imageView.frame.size.height + imageView.frame.origin.y + 20, 72.0, 37.0)];

为imageView和按钮之间的某个空间提供了+20。希望这会有所帮助：）

Answer 2

使用以下代码

- (void)loadView {
[super loadView];

imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"SteveJobsMacbookAir.JPG"]];
[imageView setFrame:CGRectMake(80.0, 20.0, 160.0, 230.0)];
[imageView setContentMode:UIViewContentModeScaleAspectFit];

[[self view] addSubview:imageView];

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
//Change bellow line
[button addTarget:self action:@selector(cropImage:) forControlEvents:UIControlEventTouchUpInside];
[button setFrame:CGRectMake(124.0, 258.0, 72.0, 37.0)];
[button setTitle:@"Crop!" forState:UIControlStateNormal];

[[self view] addSubview:button];
}  
//Change to this function
- (void)cropImage:(UIButton *)sender {
[imageView setFrame:CGRectMake(80.0, 20.0, 160.0, 230.0)];
sender.center = CGPointMake(sender.center.x,imageView.center.y);
}

如何在图像的框架改变大小时创建一个始终位于图像正下方的按钮

2 个答案: